Specifications

Advanced Point Configuration
PlantScape Server and Client Configuration Guide 191
Scanning Scheduling
Property Description
Channel Shows the channel number and name.
Status Shows the channel service status (for example, OK for “in service”,
DISABLED for “out of service”).
Ovld Indicates an overload if the channel is unable to process all its
requests or the channel cannot do the work it was requested to do in
the time specified.
Daq and Cnt These columns list the number of data acquisition requests
outstanding and control requests outstanding for each channel. These
two figures should usually be on or near zero. If either of these figures
increase to a number over 100 and do not decrease, the channel
cannot process all of its scan load. This will lead to a scan overload
that will be indicated in the Ovld column.
At the top of the acquisition and control columns are figures that refer
to the number of queue entries available to the server in order to
perform each action. These figures should always be greater than
zero. Lower down in the list of channels, there might be non-zero
numbers associated with unimplemented channels. You can ignore
the figures for unimplemented channels.
Deferred,
Immediate, &
Configuration
These fields are used by Honeywell for diagnostic purposes.
Property Description
Scan units Shows the number of milliseconds specified for the basic scanning unit.
This figure is usually 500 m.s. (i.e. 0.5 second) and should only be altered
by Honeywell.
Period Lists the scan periods configured on your system. Periods are shown in
number of scan units.
Clock If the value displayed in the Clock column is 0 or greater, this indicates
that the period is idle. When the clock is negative, that period is carrying
out scanning.
Taking the 60 period as an example, if there were only 2 requests on the
period, then one would be processed at -1, and the other at -31, at which
time the ‘clock’ would go to 29. The more scan packets per period, the
closer the clock will get to counting between 0 and -period.
plscpcg.book Page 191 Monday, May 28, 2001 10:11 AM